Before coloring the entire hair, it is recommended to perform a color test on a hidden section of hair. Choose the lightest hair strand or an area with the most gray hair. Use gloves. Mix in a ratio of 1:3 (1 part powder + 3 parts boiling water, green or black tea, coffee, or sour milk product). Using a brush or hands, apply the color generously and as hot as possible to clean, dry hair. Start from the tips and work your way up. Wrap the hair in film (plastic bag) and a towel to keep it warm and moist. Let the color sit for 25-90 minutes depending on the desired color intensity. Rinse the hair thoroughly and wash with shampoo. For the best result, rinse with ZENZ Hair & Scalp Rinse No. 87 after shampooing and before conditioner. Store in a cool, dry, and dark place.